Majority advantage in Senate seats up for re-election, 1790 – 2018

CPI Staff — Monday, October 23, 2017
Year Majority Seats Up Minority Seats Up Majority
Advantage
2018 8 23 15
2008 12 23 11
1954 12 20 8
1898 11 19 8
1928 12 19 7
1982 13 19 6
1952 13 19 6
1972 14 19 5
2004 15 19 4
1896 13 17 4
1882 11 15 4
1934 14 17 3
1884 11 14 3
1846 8 11 3
1842 7 10 3
1836 7 10 3
1998 16 18 2
1956 15 17 2
1920 15 17 2
1914 16 18 2
1894 14 16 2
1888 12 14 2
1830 7 9 2
1990 17 18 1
1978 16 17 1
1798 5 6 1
1794 4 5 1
1932 16 16 0
1906 15 15 0
1852 10 10 0
1834 8 8 0
1826 8 8 0
2010 19 18 -1
1862 10 9 -1
1854 11 10 -1
1792 6 5 -1
2006 17 15 -2
1922 17 15 -2
1916 17 15 -2
1832 9 7 -2
1988 18 15 -3
1966 18 15 -3
1924 17 14 -3
1880 14 11 -3
1864 9 6 -3
1856 12 9 -3
1838 10 7 -3
1804 7 4 -3
2000 19 15 -4
1996 19 15 -4
1962 19 15 -4
1948 18 14 -4
1918 18 14 -4
1900 17 13 -4
1890 16 12 -4
1814 8 4 -4
1800 7 3 -4
1984 19 14 -5
1908 18 13 -5
1886 15 10 -5
1844 11 6 -5
1828 10 5 -5
1820 10 5 -5
1796 8 3 -5
1790 7 2 -5
2014 21 15 -6
1992 20 14 -6
1974 20 14 -6
1970 24 18 -6
1930 19 13 -6
1912 19 13 -6
1902 18 12 -6
1860 14 8 -6
1808 9 3 -6
1994 20 13 -7
1892 18 11 -7
1850 14 7 -7
1816 9 2 -7
1810 9 2 -7
1806 9 2 -7
1802 9 2 -7
1958 20 12 -8
1950 20 12 -8
1936 19 11 -8
1876 17 9 -8
1840 13 5 -8
1818 11 3 -8
1812 10 2 -8
1878 17 8 -9
1866 13 4 -9
1848 14 5 -9
2002 21 11 -10
1944 21 11 -10
2012 21 10 -11
1976 21 10 -11
1960 22 11 -11
1946 21 10 -11
1986 24 12 -12
1968 23 11 -12
1868 17 5 -12
1858 17 5 -12
1822 14 2 -12
2016 24 10 -14
1980 24 10 -14
1942 23 9 -14
1824 15 1 -14
1874 20 5 -15
1940 23 7 -16
1904 23 7 -16
1872 20 4 -16
1964 26 9 -17
1870 21 4 -17
1926 25 7 -18
1910 24 6 -18
1938 29 3 -26